Journal List > J Korean Soc Transplant > v.32(2) > 1097291

Kang, Choi, Park, Park, and Jang: Results of Questionnaire Survey of Current Immune Monitoring Practice of Transplant Clinicians and Clinical Pathologists in Korea: Basis for Establishment of Harmonized Immune Monitoring Guidelines

Abstract

Detection of significant alloimmune response, which affects graft function and survival by effective immune monitoring, is critical for treatment decision making. However, there is no consensus regarding immune monitoring (IM) for kidney transplantation (flow KT) in Korea. The IM protocol may be affected by the level of immunological risk, the methods of desensitization and the availabilities of resources such as laboratory support and cost of tests. Questionnaire surveys designed to identify the current practices regarding immune monitoring of KT among transplant clinicians and clinical pathologists in Korea and eventually provide a basis for the establishment of harmonized immune monitoring guidelines in KT were administered as part of a Korean Society for Transplantation Sponsored Research Project. The survey results revealed significant variations in IM protocols and interpretation of tests affecting treatment decisions between institutes. Moreover, the results revealed a need to expand the histocompatibility tests into high resolution HLA typing in multiple loci and non-HLA antibody tests that facilitate the epitope analysis and eventually virtual crossmatching. The results of the questionnaire survey from clinical pathologists are addressing the urgent need for the standardization of interpretation and harmonization of results reporting in single antigen bead based HLA antibody identification. Finally, communication between clinicians and clinical pathologists to meet the clinical expectations regarding various immune monitoring tests is needed.

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Fig. 1.
Proportions of transplant clinicians responded in questionnaire surveys according to (A) specialties and (B) number of clinicians per single institute.
jkstn-32-13f1.tif
Fig. 2.
The number of kidney transplantation performed per year in institutes where the transplant clinicians responded to questionnaire survey. Abbreviation: KT, kidney transplantation.
jkstn-32-13f2.tif
Fig. 3.
Status of performing protocol biopsies after kidney transplantation. Responses of 32 clinicians from 25 institutes.
jkstn-32-13f3.tif
Fig. 4.
Status of performing protocol biopsies depending on the level of immunological risk after kidney transplantation. The protocol biopsies are being performed in recipients with high immunological risk or regardless of immunological risk in different time points. Two clinicians responded that protocol biopsies are necessary on 1∼2 week and 12 week posttransplant. Responses of 32 clinicians from 25 institutes.
jkstn-32-13f4.tif
Fig. 5.
Status of performing HLA antibody tests in (A) pre- and (B) post-kidney transplantation. Responses of 32 clinicians from 25 institutes. Abbreviation: SA ID, single antigen identification.
jkstn-32-13f5.tif
Fig. 6.
Status of performing HLA antibody tests depending on the level of immunological risk after kidney transplantation. (A) HLA antibody screening test, (B) HLA antibody phenotyping test, and (C) HLA antibody single antigen identification test. Abbreviation: HLA, human leukocyte antigen.
jkstn-32-13f6.tif
Fig. 7.
Suggested time points of HLA antibody monitoring test in patients waiting for kidney transplantation. Abbreviation: HLA, human leukocyte antigen.
jkstn-32-13f7.tif
Fig. 8.
Indications of HLA antibody tests after kidney transplantation. Abbreviations: HLA, human leukocyte antigen; AMR, antibody mediated rejection.
jkstn-32-13f8.tif
Fig. 9.
The threshold of %PRA to define high immunological risk in patients responded from 26 clinicians of 20 institutes. Abbreviation: PRA, percent reactive antibodies.
jkstn-32-13f9.tif
Fig. 10.
Clinicians opinions about the need of further tests on histocompatibility. Abbreviation: HLA, human leukocyte antigen.
jkstn-32-13f10.tif
Fig. 11.
Clinicians opinions about the need of further immune monitoring tests. Abbreviations: IGRA, interferon gamma releasing assay; CMV, cytomegalovirus; eGFR, estimated glomerular filtration rate.
jkstn-32-13f11.tif
Fig. 12.
Clinicians opinions in areas which needs to be improved. Abbreviations: HLA, human leukocyte antigen; IM, immune monitoring.
jkstn-32-13f12.tif
Fig. 13.
The principles of methods for HLA typing for kidney transplantation in responded laboratories according to the number of kidney transplantation performed per year in institutes. The data of three institutes referring HLA typing to outside labs are not included (∗) and the data of one institute of each performing HLA typing using two different methods are included (∗∗). Abbreviations: SSP, sequence-specific polymerase chain reaction; rSSOP, reverse sequence-specific oligonucleotide probe hybridization.
jkstn-32-13f13.tif
Fig. 14.
HLA loci tested for kidney transplantation in responding laboratories. Abbreviation: HLA, human leukocyte antigen.
jkstn-32-13f14.tif
Fig. 15.
The status of performing HLA antibody tests in responded laboratories according to the number of kidney transplantation performed per year in institutes. (A) Screening test, (B) Phenotyping, (C) Single antigen bead identification. Abbreviation: HLA, human leukocyte antigen.
jkstn-32-13f15.tif
Fig. 16.
Clinical pathologist opinions on current shortcomings in laboratory practices.
jkstn-32-13f16.tif
Table 1.
Clinicians opinions about the impact of immune monitoring tests on deciding treatment strategies regardless of current practices
Immune monitoring tests Total Effect No effect Not performing No answer
HLA type matching 32 19 (59) 12 (38) 0 (0) 1 (3)
DSA(−) but high PRA 32 26 (81) 5 (16) 0 (0) 1 (3)
DSA (+) 32 31 (97) 0 (0) 0 (0) 1 (3)
DQ DSA alone 27 18 (67) 9 (33) 0 (0) 0 (0)
C or DP DSA alone 27 7 (26) 19 (70) 1 (3) 0 (0)
Complement binding antibody (+) 32 18 (56) 11 (34) 2 (6) 1 (3)
CDC crossmatching, T cell (+) 32 31 (97) 0 (0) 0 (0) 1 (3)
CDC crossmatching, B cell (+) 32 29 (91) 2 (6) 0 (0) 1 (3)
FCM crossmatching, T cell (+) 32 30 (94) 0 (0) 1 (3) 1 (3)
FCM crossmatching, B cell (+) 32 27 (84) 0 (0) 2 (6) 1 (3)
Biopsy finding 32 31 (97) 0 (0) 0 (0) 1 (3)
MIC antibody (+) 32 5 (16) 24 (75) 2 (6) 1 (3)
Lymphocyte subset analysis 32 4 (13) 27 (84) 0 (0) 1 (3)

Abbreviations: DSA, donor specific antibody; PRA, percent reactive antibody; CDC, complement dependent cytotoxicity; FCM, flow cytometry; MIC, MHC class I chain-related protein.

Table 2.
The threshold of DSA MFI in each locus to define high immunological risk in patients responded from 32 clinicians of 25 institutes
Threshold of DSA MFI AB (n=26) DR (n=26) DQ (n=22)
1,000 6 7 6
2,000∼3,000 8 7 7
4,000 1 1 1
5,000 9 9 7
10,000 2 2 1
c

Abbreviations: DSA, donor specific antibody; MFI, mean fluorescence intensity.

Table 3.
The format and content of single antigen bead based HLA antibody identification result reporting in different HLA laboratories (n=18)
Contents of SAB identification No. of laboratories (%)
Resolution
  Serological equivalent 7 (39)
  Generic/allelic type 6 (33)
  Both 5 (28)
Reporting of antibodies
  Anti-DQB1 18 (100)
  Anti-DPB1 11 (61)
  Anti-DQA1 or -DPA1 9 (50)
Reporting of MFI values
  MFI interval 7 (39)
  Each MFI 9 (50)
  MFI max 1 (6)
  Not reporting 1 (6)
Reporting of % PRA
  % cPRA 13 (72)
  % cPRA including DQ antibodies 11 (61)
  Each Class I and II 8 (44)
  Combined Class I and II 2 (11)
  Both 2 (11)

Abbreviations: SAB, single antigen bead; MFI, mean fluorescence intensity; % cPRA, % calculated percent reactive antibodies.

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